Question

Помогите пожалуйсто очень надо!!! $left { {{{frac{z+31 }{8} + frac{z+12} {5} > frac{z}{3}} atop {{frac{2z+1 }{3} -frac{z+12} {8} > frac{3z-5}{4}}} right.$

Answer 1

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e60c9417ada482ce7d8ddecf0f108cfc.docx

Answer 2

$left { {{{frac{z+31 }{8} + frac{z+12} {5} > frac{z}{3}} atop {{frac{2z+1 }{3} -frac{z+12} {8} > frac{3z-5}{4}}} right. <=>left { {{{frac{15(z+31) }{120} + frac{24(z+12)}{120} > frac{40z}{120}} atop {{frac{8(2z+1)}{24} -frac{3(z+12)}{24} > frac{6(3z-5)}{24}}} right.<=>\ left { 15(z+31)+24(z+12)}> 40z} atop {8(2z+1)-3(z+12)>6(3z-5) right. <=> left { 15z+465+24z+288}> 40z} atop {16z+8-3z-36>18z-30 right. <=>$
$left { 39z+753}> 40z} atop {13z-28>18z-30 right. <=> left { 39z-40z}> -753} atop {13z-18z>-30+28 right. <=> \ left { -z}> -753} atop {-5z>-2 right. <=>left { z}<753} atop {z<0,4 right. \ (- infty; 0,4)$

e60c9417ada482ce7d8ddecf0f108cfc.docx